6 Questions
What is the order of magnitude of the voltage produced between ECG leads due to the largest action potentials in the body?
1mV
How are the action potentials in the heart measured externally?
Using external electrodes
What do the measurable voltages at the skin resulting from heart action potentials represent?
Direct measurement of body-produced voltages
Which area of the heart can act as a pacemaker if the SA node and AV node are not working?
His-Purkinje cells
At what rate do the His-Purkinje cells normally contract?
30-50 bpm
If the SA node is not working, which area of the heart will act as the pacemaker?
AV node
Test your knowledge about the measurement of action potentials in the heart through external electrodes, resulting in ECG recordings. Understand the significance of the voltages produced by the body and their measurement in ECG leads.
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